| APA | UDI. (2012, February 9). In Acronym Geek. Retrieved 00:13, February 9, 2012, from http://www.acronymgeek.com/UDI |
| MLA | "UDI." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/UDI>. |
| MHRA | 'UDI', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/UDI> [accessed 9 February 2012] |
| Chicago | "UDI", http://www.acronymgeek.com/UDI (accessed February 9, 2012). |
| CBE/CSE | UDI [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/UDI. |
| Bluebook | UDI, http://www.acronymgeek.com/UDI (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, UDI, http://www.acronymgeek.com/UDI (optional description here) (as of Feb. 9, 2012, 00:13). |
| AMA | UDI. Acronym Geek. February 9, 2012, 00:13. Available at: http://www.acronymgeek.com/UDI. Accessed February 9, 2012, 00:13. |